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In-house Technical Standard regarding to Bending Pipes

●Dimensional tolerance

Cold bending Hot bending
　　　　2.5D3D5D7D D/t　　R3D5D7D10D
SPG ½～65533 10＜D/T≦20321.51
SCH40 ½～45533 20＜D/T≦303.52.521
SCH40 5,68877 30＜D/T≦4042.521.5
SCH80 ½～44433 40＜D/T≦504321.5
SCH80 5101088 50＜D/T≦605432

2.5D 3D 5D 7D 10D
Cold bending 17 15 15 12 -
Hot bending SGP - 15～18 10 8 6
SCH40 - 18～20 15 10 8
SCH80 - 8～10 6～8 5～6 4
Rate will change according to the bending radius of wall thickness. Apply to carbonic steel and copper pipe

●Clamping Length

Unit(mm)
Cold bending Hot bending
nominal diameter Ｎ Ｚ nominal diameter Ｎ Ｚ
½ 50 50 2 1/2 200 250
¾ 50 50 3 200 250
1 70 60 4 200 250
1 ¼ 100 70 5 250 250
1 ½ 100 80 6 250 250
2 100 100 8 300 300
2 ½ 200 150 10 350 350
3 200 180 12 400 400
4 200 200 14 400 400
5 200 250 16 500 600
6 200 250

●Dimensional tolerance

Unit(mm)
1.R
2.Pitch
3.Middle measurement
4.Angle
5.L measurement


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■Hot bending　The minimum bending radius (R) (for reference)

Carbon Steel Pipe Stainless Steel Pipe　　TPA　　Standard wall thickness　　＊for reference
SGP SCH40 SCH80 SCH160 SCH5S SCH10S SCH20S SCH40S SCH80S SCH160S
A B t R t R t R t R t R t R t R t R t R t R Clamping length
40 1 ½ 3.5 150 3.7 140 5.1 140 7.1 150 2.0 400 3.0 250 3.0 250 4.0 200 5.0 200 7.1 200 200
50 2 3.8 150 3.9 140 5.5 140 8.7 150 2.0 400 3.0 250 3.5 230 4.0 200 5.5 200 8.7 200 200
65 2 ½ 4.2 150 5.2 150 7.0 200 9.5 200 2.0 500 3.0 260 3.5 250 5.0 220 7.0 220 9.5 220 200
80 3 4.2 180 5.5 180 7.6 200 11.1 230 2.0 500 3.0 270 4.0 250 5.5 220 8.0 220 11.1 250 200
90 3 ½ 4.2 180 5.7 180 8.1 200 12.7 250 2.5 500 3.0 300 4.0 270 6.0 230 8.0 230 12.7 280 200
100 4 4.5 200 6.0 200 8.6 250 13.5 280 2.5 600 3.0 350 4.0 280 6.0 250 9.0 250 13.5 300 200
125 5 4.5 250 6.6 220 9.5 250 15.9 350 3.0 480 3.5 450 5.0 400 7.0 350 10.0 350 15.9 400 250
150 6 5.0 300 7.1 300 11.0 330 18.2 400 3.0 800 3.5 550 5.0 450 7.0 400 12.0 400 18.2 500 250
200 8 5.8 400 8.2 450 12.7 550 23.0 600 4.0 1,000 6.5 550 8.0 500 13.0 600 23.0 700 300
250 10 6.6 550 9.3 550 15.1 600 28.6 800 4.0 1,000 6.5 800 10.0 650 15.0 650 28.6 1,000 300
300 12 6.9 660 10.3 600 17.4 600 33.3 1,000 4.5 1,800 6.5 1,300 10.0 1,100 18.0 900 33.3 1,200 400
350 14 7.9 800 11.1 800 19.0 800 35.7 X 6.5 1,500 400
400 16 7.9 1,200 12.7 1,000 21.4 1,000 40.5 X *5.0 3,600 *6.0 3,000 *8.0 1,500 *9.3 1,500 500

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■Hot bending　Minimum Bending Radius of Square Pipe（R)STKR400　SUS304

1.6 2.3 3.2 4.0 4.5 6.0 9.0
Size A B F A B F A B F A B F A B F A B F A B F
40x40 500 - - 400 - - 400 - - 350 - - 300 - - 250 - - 250 - -
50x50 500 - - 400 - - 400 - - 350 - - 300 - - 250 - - 250 - -
50x20 - 500 500 - 400 400 - 400 400 - 350 350 - 300 300 - 250 250 - 250 250
50x30 - 500 500 - 400 400 - 400 400 - 350 350 - 300 300 - 250 250 - 250 250
60x60 600 - - 500 - - 400 - - 350 - - 300 - - 250 - - 250 - -
60x30 - 600 500 - 500 400 - 400 300 - 350 350 - 300 300 - 250 250 - 250 250
75x75 X - - 700 - - 400 - - 350 - - 300 - - 300 - - 300 - -
75x20 - X X - 600 X - 400 X - 350 X - 300 X - 300 X - 300 X
75x45 - X X - 600 500 - 400 300 - 350 350 - 300 300 - 300 300 - 300 300
80x80 - - - 900 - - 500 - - 400 - - 300 - - 300 - - 300 - -
80x40 - X X - 900 800 - 500 400 - 400 380 - 300 300 - 300 300 - 300 300
90x90 X - - 1200 - - 700 - - 700 - - 700 - - 300 - - 300 - -
90x45 - X X - 1000 700 - 700 500 - 700 700 - 700 600 - 300 300 - 300 300
100x100 X - - 1500 - - 800 - - 600 - - 500 - - 300 - - 300 - -
100x20 - X X - 1400 X - 700 X - 700 X - 500 X - 300 X - 300 X
100x40 - X X - 1400 1000 - 700 500 - 700 500 - 500 400 - 300 300 - 300 300
100x50 - X X - 1400 1000 - 700 500 - 700 500 - 500 400 - 300 300 - 300 300
125x125 X - - X - - 1000 - - 1000 - - 800 - - 600 - - 600 - -
125x40 - X X - X X - 1000 X - 900 X - 800 X - 600 X - 600 X
125x75 - X X - X X - 950 850 - 850 750 - 800 700 - 600 500 - 600 500
150x150 X - - X - - SUSは4tから 1400 - - 1000 - - 800 - - 600 - -
150x50 - 1700 1500 - 1400 X - 1100 X - 800 X - 600 X
150x75 - 1500 1300 - 1400 1200 - 1100 1000 - 800 800 - 600 600
150x80 - 1500 1300 - 1400 1200 - 1100 1000 - 800 800 - 600 600
150x100 - 1500 1300 - 1400 1200 - 1100 1000 - 800 800 - 600 600
175x175 X - - 1600 - - 1200 - - 850 - - 700 - -
200x200 X - - X - - 1500 - - 900 - - 800 - -
200x75 - X - - X X - 1200 X - 900 X - 700 X
200x80 - X - - X X - 1200 X - 900 X - 700 X
200x100 - X - - X X - 1200 1000 - 900 900 - 700 700
200x150 - X - - X X - 1200 1000 - 1000 900 - 800 700
250x250 X - - X - - X - - 1500 - - 1200 - -

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■Cold Bender Roll table and the minimum Bendable wall thickness (for reference)

Size(mm) Material
6.0φ 12R 19.8R 24R 27.6R 32.5R 35.5R 43.2R 58.8R
CARBON Wall thickness 1.0 → → → → → → →
SUS Wall thickness 0.5 → → → → → → →
7.0φ 47.5R 61R 8.0φ 16R 34R
CARBON Wall thickness 1.0 → CARBON 1.0 → →
SUS Wall thickness 1.0 → SUS 0.8 → →
10.0φ 20R 33R 46R 59R 72R 74R 85R 98R 111R
CARBON Wall thickness 1.0 → → → → → → → →
SUS Wall thickness 0.8 → → → → → → → →
(6A)　10.5φ 15R 22R 25R 12.0φ 20R 21.25R 25R 37.5R 12.7φ 35R
CARBON Wall thickness 1.0 → → CARBON 1.0 → → → CARBON 1.0
SUS Wall thickness 1.0 → → SUS 1.0 → → → SUS 1.0
(8A)　13.8φ 22.5 30R 32R 36R 40R 45R 50R 55R 60R 65R 70R 80R 85R
CARBON Wall thickness 1.5 → → → → → → → → → → → →
SUS Wall thickness 1.2 → → → → → → → → → → → →
15.0φ 45R 15.9φ 25R
CARBON Wall thickness 1.5 CARBON 1.5
SUS Wall thickness 1.5 SUS 1.5
16.0φ 22R 22.5R 24R 30R 32.5R 33R 42.5R 55R 65R 78R 110R 130.5R 160R 177.5R
CARBON Wall thickness 1.5 → → → → → → → → → → → → →
SUS Wall thickness 1.2 → → → → → → → → → → → → →
(10A)　17.3φ 30R 35R 38R 40R 45R 50R 60R 65R 70R 75R 80R 90R 100R
CARBON Wall thickness 1.5 → → → → → 1.2 → → → → → →
SUS Wall thickness 1.2 → → → → → 1.0 → → → → → →
19.0φ 27.5R 30R 38R 40R 45R 60R 70R 87.5R 100R 115R 140R 146R 150R 170R
CARBON Wall thickness 2.0 → → → 1.6 → 1.2 → → → → → → →
SUS Wall thickness 1.5 → → → → → → → → → → → → →
(15A)　21.7φ 26R 31R 35R 36.5R 38R 40R 45R 50R 60R 63R 65R 67.5R 70R 72R
CARBON Wall thickness 2.8 → → → → → → 1.6 → → → → → →
SUS Wall thickness 2.0 → → → → → → 1.5 → → → → → →
75R 80R 90R 95R 100R 105R 107.5R 110R 118R 130R 137R 150R 200R 225R
CARBON Wall thickness 1.6 → → → → → → → → → → → → →
SUS Wall thickness 1.5 → → → → → → → → → → → → →
25.0φ 32R 45R 55R 90R 115R (25.4φ) 40R 50R
CARBON Wall thickness 2.3 → → → → CARBON 2.3 →
SUS Wall thickness 2.0 → → → → SUS 2.0 →
(20A)　27.2φ 38R 40R 42.5R 45R 47R 50R 55R 60R 62.5R 65R 70R 75R 80R
CARBON Wall thickness 2.8 → → → → → → → 2.3 → → → → →
SUS Wall thickness 2.0 → → → → → → → 1.9 → → 1.5 → →
85R 87.5R 90R 95R 100R 110R 115R 120R 125R 130R 135R 170.5R 200R 250R
CARBON Wall thickness 2.3 → → → 1.5 → → → → → → → → →
SUS Wall thickness 1.5 → → → → → → → → → → → → →
28.0φ 90R 31.8φ 65R 105R 140R 170R 175R 250R
CARBON Wall thickness 2.3 CARBON 2.3 1.6 → → → →
SUS Wall thickness 1.5 SUS 2.0 1.5 → → → →
32.0φ 50R 55R 70R 75R 90R 120R 125R
CARBON Wall thickness 2.3 → → → → 2.0 →
SUS Wall thickness 2.0 → → → → → →

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Size(mm) Material
(25A)　34.0φ 45R 50R 55R 60R 62.5R 65R 70R 75R 85R 90R 100R 105R 115R
CARBON Wall thickness 3.2 → → → → → 2.3 → → → → → →
SUS Wall thickness 2.0 → → → → → → → 1.5 → 1.2 → →
120R 125R 135R 140R 150R 160R 170R 180R 185R 200R 220R 250R 270R 300R
CARBON Wall thickness 2.3 → → → → → → → → → → → 350R 400R
SUS Wall thickness 1.2 → → → → → → → → → → →
38.0φ 50R 60R 90R 100R 120R 140R 150R 165R 170R 205R
CARBON Wall thickness 3.2 → → → 2.3 → → → → →
SUS Wall thickness 3.0 → → → 2.0 → → → → →
(32A)　42.7φ 60R 62.5R 65R 75R 80R 95R 100R 110R 120R 125R 130R 137R 140R 150R
CARBON Wall thickness 3.5 → → 3.2 → → 2.3 → → → 2.0 → → →
SUS Wall thickness 3.0 → → → → 2.5 2.0 → → → → → → →
170R 180R 190R 200R 225R 240R 250R 270R 300R 350R 400R
CARBON Wall thickness 2.0 → → → → → → → → → →
SUS Wall thickness 2.0 → → → → → → → → → →
(40A)　48.6φ 67R 70R 75R 80R 85R 90R 95R 100R 110R 114R 120R 125R 150R 165R
CARBON Wall thickness 3.5 → → → 3.2 → → 2.3 → → → → → →
SUS Wall thickness 2.0 → → → → → → → → → → → 1.5 →
170R 175R 180R 185R 200R 225R 250R 270R 275R 300R 350R 375R 400R 450R
CARBON Wall thickness 2.3 → → → → → → → → → → → → →
SUS Wall thickness 1.5 → → → → → → → → → → → → →
500R 600R 700R
CARBON Wall thickness 2.3 → →
SUS Wall thickness 1.5 → →
50.0φ 80R 110R 55.0φ 80R 100R (57.0R) 75R
CARBON Wall thickness 3.5 → CARBON 3.5 → CARBON 3.8
SUS Wall thickness 3.0 → SUS 3.0 → SUS 3.0
(50A)　60.5φ 80R 90R 100R 107.5R 110R 112R 115R 120R 125R 130R 145R 150R 160R 175R
CARBON Wall thickness 3.8 → → → 3.2 → → → 2.3 → → → → →
SUS Wall thickness 3.0 → 2.0 → → → → → → → → 1.5 → →
180R 190R 200R 225R 250R 270R 300R 320R 350R 400R 450R 500R 600R 700R
CARBON Wall thickness 2.3 → → → → → → → → → → → → →
SUS Wall thickness 1.5 → → → → → → → → → → → → →
63.5φ 165R 381R 400R 70.0φ 165R
CARBON Wall thickness 2.3 → → 2.3 →
SUS Wall thickness 2.0 → → 2.0 →
(65A)　76.3φ 177R 200R 230R 250R 270R 300R 330R 350R 375R 400R 450R 500R 600R 650R
CARBON Wall thickness 2.8 → → → → → → → → → → → → →
SUS Wall thickness 3.0 → → → → 2.0 → → → → → → → →
700R 800R 850R 1000R 1200R
CARBON Wall thickness 2.8 → → → →
SUS Wall thickness 2.0 → → → →
(80A)　89.1φ 200R 230R 240R 250R 270R 275R 300R 330R 350R 375R 380R 400R 450R
CARBON Wall thickness 2.8 → → → → → → → → → → → →
SUS Wall thickness 3.0 → → → → → → → → → → → →
500R 600R 650R 700R 800R 850R 920R 1000R
CARBON Wall thickness 2.8 → → → → → → →
SUS Wall thickness 2.0 → → → → → → →
(90A)　101.6φ 254R 270R 275R 300R 350R 400R 450R 500R 600R 650R 700R 800R 850R 1000R
CARBON Wall thickness 3.2 → → → → → → → → → → → → →
SUS Wall thickness 3.0 → → → 2.5 → → → → → → → → →
(100A)　114.3φ 200R 254R 300R 350R 400R 450R 500R 600R 650R 700R 750R 800R 850R 1000R
CARBON Wall thickness 6.0 3.5 → → → → → → → → → → → →
SUS Wall thickness 3.0 → → → → → → → → → → → →
(125A)　139.8φ 345R 375R 400R 425R 450R 500R 600R 800R 1000R
CARBON Wall thickness 3.5 → → → → → → → →
SUS Wall thickness 4.0 → → → → → → 3.5 →
(150A)　165.2φ 400R 500R 800R 1000R
CARBON Wall thickness 5.0 → 3.8 →
SUS Wall thickness 4.0 → → →

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